Asymmetric structure in Sgr A* at 3 mm from closure phase measurements with VLBA, GBT and LMT

Christiaan D. Brinkerink; Cornelia Müller; Heino Falcke; Geoffrey C. Bower; Thomas P. Krichbaum; Edgar Castillo; Adam T. Deller; Sheperd S. Doeleman; Raquel Fraga-Encinas; Ciriaco Goddi; Antonio Hernández-Gómez; David H. Hughes; Michael Kramer; Jonathan Léon-Tavares; Laurent Loinard; Alfredo Montaña; Monika Mościbrodzka; Gisela N. Ortiz-León; David Sanchez-Arguelles; Remo P.J. Tilanus; Grant W. Wilson; J. Anton Zensus

doi:10.1093/mnras/stw1743

Asymmetric structure in Sgr A* at 3 mm from closure phase measurements with VLBA, GBT and LMT

Christiaan D. Brinkerink
, Cornelia Müller
, Heino Falcke
, Geoffrey C. Bower
, Thomas P. Krichbaum
, Edgar Castillo
, Adam T. Deller
, Sheperd S. Doeleman
, Raquel Fraga-Encinas
, Ciriaco Goddi
, Antonio Hernández-Gómez
, David H. Hughes
, Michael Kramer
, Jonathan Léon-Tavares
, Laurent Loinard
, Alfredo Montaña
, Monika Mościbrodzka
, Gisela N. Ortiz-León
, David Sanchez-Arguelles
, Remo P.J. Tilanus

Grant W. Wilson, J. Anton Zensus

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

We present the results of a closure phase analysis of 3 mm very long baseline interferometry measurements performed on Sagittarius A* (Sgr A*).We have analysed observations made in 2015 May using the Very Long Baseline Array, the Robert C. Byrd Green Bank Telescope and the Large Millimeter Telescope Alfonso Serrano and obtained non-zero closure phase measurements on several station triangles - indicative of a non-point-symmetric source structure. The data are fitted with an asymmetric source structure model in Sgr A*, represented by a simple two-component model, which favours a fainter component due east of the main source. This result is discussed in light of a scattering screen with substructure or an intrinsically asymmetric source.

Original language	English (US)
Pages (from-to)	1382-1392
Number of pages	11
Journal	Monthly Notices of the Royal Astronomical Society
Volume	462
Issue number	2
DOIs	https://doi.org/10.1093/mnras/stw1743
State	Published - Oct 21 2016
Externally published	Yes

Keywords

Accretion, accretion discs
Galaxies: active
Galaxies: jets
Radio continuum: galaxies
Techniques: interferometric

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/mnras/stw1743

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Brinkerink, C. D., Müller, C., Falcke, H., Bower, G. C., Krichbaum, T. P., Castillo, E., Deller, A. T., Doeleman, S. S., Fraga-Encinas, R., Goddi, C., Hernández-Gómez, A., Hughes, D. H., Kramer, M., Léon-Tavares, J., Loinard, L., Montaña, A., Mościbrodzka, M., Ortiz-León, G. N., Sanchez-Arguelles, D., ... Zensus, J. A. (2016). Asymmetric structure in Sgr A* at 3 mm from closure phase measurements with VLBA, GBT and LMT. Monthly Notices of the Royal Astronomical Society, 462(2), 1382-1392. https://doi.org/10.1093/mnras/stw1743

Brinkerink, CD, Müller, C, Falcke, H, Bower, GC, Krichbaum, TP, Castillo, E, Deller, AT, Doeleman, SS, Fraga-Encinas, R, Goddi, C, Hernández-Gómez, A, Hughes, DH, Kramer, M, Léon-Tavares, J, Loinard, L, Montaña, A, Mościbrodzka, M, Ortiz-León, GN, Sanchez-Arguelles, D, Tilanus, RPJ, Wilson, GW & Zensus, JA 2016, 'Asymmetric structure in Sgr A* at 3 mm from closure phase measurements with VLBA, GBT and LMT', Monthly Notices of the Royal Astronomical Society, vol. 462, no. 2, pp. 1382-1392. https://doi.org/10.1093/mnras/stw1743

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title = "Asymmetric structure in Sgr A* at 3 mm from closure phase measurements with VLBA, GBT and LMT",

abstract = "We present the results of a closure phase analysis of 3 mm very long baseline interferometry measurements performed on Sagittarius A* (Sgr A*).We have analysed observations made in 2015 May using the Very Long Baseline Array, the Robert C. Byrd Green Bank Telescope and the Large Millimeter Telescope Alfonso Serrano and obtained non-zero closure phase measurements on several station triangles - indicative of a non-point-symmetric source structure. The data are fitted with an asymmetric source structure model in Sgr A*, represented by a simple two-component model, which favours a fainter component due east of the main source. This result is discussed in light of a scattering screen with substructure or an intrinsically asymmetric source.",

keywords = "Accretion, accretion discs, Galaxies: active, Galaxies: jets, Radio continuum: galaxies, Techniques: interferometric",

author = "Brinkerink, \{Christiaan D.\} and Cornelia M{\"u}ller and Heino Falcke and Bower, \{Geoffrey C.\} and Krichbaum, \{Thomas P.\} and Edgar Castillo and Deller, \{Adam T.\} and Doeleman, \{Sheperd S.\} and Raquel Fraga-Encinas and Ciriaco Goddi and Antonio Hern{\'a}ndez-G{\'o}mez and Hughes, \{David H.\} and Michael Kramer and Jonathan L{\'e}on-Tavares and Laurent Loinard and Alfredo Monta{\~n}a and Monika Mo{\'s}cibrodzka and Ortiz-Le{\'o}n, \{Gisela N.\} and David Sanchez-Arguelles and Tilanus, \{Remo P.J.\} and Wilson, \{Grant W.\} and Zensus, \{J. Anton\}",

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month = oct,

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doi = "10.1093/mnras/stw1743",

language = "English (US)",

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T1 - Asymmetric structure in Sgr A* at 3 mm from closure phase measurements with VLBA, GBT and LMT

AU - Brinkerink, Christiaan D.

AU - Müller, Cornelia

AU - Falcke, Heino

AU - Bower, Geoffrey C.

AU - Krichbaum, Thomas P.

AU - Castillo, Edgar

AU - Deller, Adam T.

AU - Doeleman, Sheperd S.

AU - Fraga-Encinas, Raquel

AU - Goddi, Ciriaco

AU - Hernández-Gómez, Antonio

AU - Hughes, David H.

AU - Kramer, Michael

AU - Léon-Tavares, Jonathan

AU - Loinard, Laurent

AU - Montaña, Alfredo

AU - Mościbrodzka, Monika

AU - Ortiz-León, Gisela N.

AU - Sanchez-Arguelles, David

AU - Tilanus, Remo P.J.

AU - Wilson, Grant W.

AU - Zensus, J. Anton

PY - 2016/10/21

Y1 - 2016/10/21

N2 - We present the results of a closure phase analysis of 3 mm very long baseline interferometry measurements performed on Sagittarius A* (Sgr A*).We have analysed observations made in 2015 May using the Very Long Baseline Array, the Robert C. Byrd Green Bank Telescope and the Large Millimeter Telescope Alfonso Serrano and obtained non-zero closure phase measurements on several station triangles - indicative of a non-point-symmetric source structure. The data are fitted with an asymmetric source structure model in Sgr A*, represented by a simple two-component model, which favours a fainter component due east of the main source. This result is discussed in light of a scattering screen with substructure or an intrinsically asymmetric source.

AB - We present the results of a closure phase analysis of 3 mm very long baseline interferometry measurements performed on Sagittarius A* (Sgr A*).We have analysed observations made in 2015 May using the Very Long Baseline Array, the Robert C. Byrd Green Bank Telescope and the Large Millimeter Telescope Alfonso Serrano and obtained non-zero closure phase measurements on several station triangles - indicative of a non-point-symmetric source structure. The data are fitted with an asymmetric source structure model in Sgr A*, represented by a simple two-component model, which favours a fainter component due east of the main source. This result is discussed in light of a scattering screen with substructure or an intrinsically asymmetric source.

KW - Accretion, accretion discs

KW - Galaxies: active

KW - Galaxies: jets

KW - Radio continuum: galaxies

KW - Techniques: interferometric

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AN - SCOPUS:84988878672

SN - 0035-8711

VL - 462

SP - 1382

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

Asymmetric structure in Sgr A* at 3 mm from closure phase measurements with VLBA, GBT and LMT

Abstract

Keywords

ASJC Scopus subject areas

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